Even so they are following official D&D rules made by WotC here. Larian didn't invent this system. And besides, this is the system we'll be getting in the game which is coming out in less than two weeks. There is no use in complaining about it now...we're past the point of early access feedback. So make the best of it.
It's likely, yes, but it's also a possibility that we may get an option to use the good old system. Admittedly, it's not likely but it's possible nonetheless. After all the presentation build was not the final release version.
Also, it's not the same system the upcoming D&D edition uses (or even the one that used in the playtest). The new new system ties the ASI to the background, not the class.
BG3 ties it to the class and while it may still be possible to simulate the true 5E ASI, it is a) not possible for all races and b) not even certain that we can truly do that.
In any case modders will most likely be able to fix this mess.
